We are trying to use the USRP with the new gmsk demod block, and are
encountering some weirdness.
To generate our GMSK signal, we are using an Agilent signal generator.
BT=0.35, 125 ksymbols/sec, 2 samples/symbol, with a PN15 as the data
source.

We load the produced slicer.dat into Matlab and cross-correlate with the
known PN15 sequence.